An investigation of the characteristics of Al2O3/TiO2 PEO nanocomposite coating

Bahramian, Ahmad Reza; Raeissi, K.; Hakimizad, Amin

doi:10.1016/j.apsusc.2015.05.107

Cited by 97 publications

(23 citation statements)

References 55 publications

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“…Wang et al investigated the corrosion resistance of scratched oxide and reported that scratches have reduced impedance and increased the corrosion current density [16]. Bahramian et al reported the effect of TiO 2 nanoparticles addition to a PEO silicate-based electrolyte in Al7075 alloy [17]. The authors showed that the fabricated composite coating demonstrated improved corrosion resistance and mechanical properties due to the lower porosity content.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of Ceramic Coating on Al7075 Alloy by Plasma Electrolytic Oxidation in Molten Salt

2020

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The fabrication of a ceramic coating on the metallic substrate is usually applied to achieve the improved performance of the material. Plasma electrolytic oxidation (PEO) is one of the most promising methods to reach this performance, mostly wear and corrosion resistance. Traditional PEO is carried out in an aqueous electrolyte. However, the current work showed the fabrication and characterization of a ceramic coating using PEO in molten salt which was used to avoid disadvantages in system heating-up and the formation of undesired elements in the coating. Aluminum 7075 alloy was subjected to the surface treatment using PEO in molten nitrate salt. Various current frequencies were applied in the process. Coating investigations revealed its surface porous structure and the presence of two oxide layers, α-Al2O3 and γ-Al2O3. Microhardness measurements and chemical and phase examinations confirmed these results. Potentiodynamic polarization tests and electrochemical impedance spectroscopy revealed the greater corrosion resistance for the coated alloy. Moreover, the corrosion resistance was increased with the current frequency of the PEO process.

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Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of Ceramic Coating on Al7075 Alloy by Plasma Electrolytic Oxidation in Molten Salt

2020

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“…This also increases the amorphous content which results in faster transport of ions by coordinating sites of the host polymer. The addition of nanofiller with high dielectric constant and high thermal stability improves the mechanical, thermal, and electrochemical properties of electrolyte due to increase in free volume and leads to increased mobility of polymer chain and reduction in crystallinity [22][23][24][25][26][27][28][29][30][31][32][33][34].To date, the high molecular weight Poly (ethylene oxide) (PEO)-based polymeric electrolytes are researched widely due to their semi crystalline nature and presence of ether group which supports faster ionic transport due to beneficial polymer flexibility [35,36]. The host polymer is polyethylene oxide (PEO) containing ether group (-Ö-) which provides coordinating sites to cation (Li + ) and Li + acts as Lewis acid.Hence it can form complex easily with many alkalis salts and provides a direct path for cation migration due to the presence of ether group (-CH2-CH2-Ö-)n in the polymer backbone.…”

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confidence: 99%

Structural, microstructural and electrochemical properties of dispersed-type polymer nanocomposite films

Arya¹,

Sharma²

2018

J. Phys. D: Appl. Phys.

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The free standing solid polymer nanocomposite (PEO-PVC)+LiPF6-TiO2 films has been prepared through standard solution cast technique. The improvement in structural, microstructural and electrochemical properties has been observed on the dispersion of nanofiller in polymer salt complex. X-Ray diffraction studies clearly reflect the formation of complex formation as no corresponding salt peak appeared in the diffractograms. The FTIR analysis suggested a clear and convincing evidence of polymer-ion, ion-ion and polymer-ion-nanofiller interaction. The highest ionic conductivity of the prepared solid polymer electrolyte films is ~5×10 -5 S cm -1 for 7 wt. % TiO2.The Linear Sweep Voltammetry provide the electrochemical stability window of the prepared solid polymer electrolyte films, which is of the order of ~3.5 V. The ion transference number has been estimated, tion =0.99 through dc polarization technique. Dielectric spectroscopic studies were performed to understand the ion transport process in polymer electrolytes. All solid polymer electrolyte possesses good thermal stability up to 300 °C. DSC analysis confirms the decrease of melting temperature and signal of glass transition temperature with addition of nanofiller which indicates the decrease of crystallinity of polymer matrix. An absolute correlation between diffusion coefficient (D), ion mobility (μ), number density (n), double layer capacitance (Cdl), glass transition temperature, melting temperature (Tm), free ion area (%) and conductivity (σ) has been observed. A convincing model to study the role of nanofiller in polymer salt complex has been proposed which supports the experimental findings. The prepared polymer electrolyte system with significant ionic conductivity, high ionic transference number, good thermal, voltage stability could be suggested as a potential candidate as electrolyte cum separator for fabrication of rechargeable lithium-ion battery system. IntroductionFrom last two decades, lithium ion batteries (LIB) are widely investigated energy source for the portable electronics because of attractive features like high energy density, shape mouldability, design flexibility, zero memory loss and high safety. The desirable characteristics of polymer electrolytes for R&D application in LIB are good compatibility with electrode materials, leakage proof, longer shelf life, high capacity and light weight [1]. The conductivity in solid state conductors was reported first time by Faraday in 1800s, and later the discovery of poly ethylene oxide (PEO) and alkali metal salts (NaI) system in the 1970s was contributed by Wright and coworkers. Then, Armand realized their technological importance due to flexibility, deformability and introduced the first new class of solid state ionic conductors (SSIC). Solid Polymer electrolytes (SPEs) comprising the high electrical conductivity along with mechanical flexibility, faster segmental motion of polymer chain makes them, best substitute over liquid electrolytes in electrochemical devices such as supercapacitor, cell ...

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“…Results presented in Table 4 reveal that presence of ketoconazole in the coating suspension laeds to fairly improved hardness and elastic modulus. Structureal porosity plays an important role in mechanical properties of caotings so that with increase in porosity, mechanical properties, particlularly hardness, are deterriorated [37,38]. Therfore, improved mechanical properties of KA-3 through addition of ketoconazole to the coating suspension is due to formation of a more compact coating with less porosity.…”

Section: Nanoindentation Testmentioning

confidence: 98%

Tribological properties of PEO nanocomposite coatings on titanium formed in electrolyte containing ketoconazole

Sharifi

Mahmood

Darband

et al. 2016

Tribology International

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An investigation of the characteristics of Al2O3/TiO2 PEO nanocomposite coating

Cited by 97 publications

References 55 publications

Fabrication and Characterization of Ceramic Coating on Al7075 Alloy by Plasma Electrolytic Oxidation in Molten Salt

Fabrication and Characterization of Ceramic Coating on Al7075 Alloy by Plasma Electrolytic Oxidation in Molten Salt

Structural, microstructural and electrochemical properties of dispersed-type polymer nanocomposite films

Tribological properties of PEO nanocomposite coatings on titanium formed in electrolyte containing ketoconazole

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